Listen freezes when network gateway blocks streaming radio ports

[pochu]

From https://launchpad.net/bugs/109631

"When connected to the internet via a gateway which firewalling functionality if the streaming ports are disallowed for a particular audio stream Listen locks up hard and has to be forceably quit."

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This happens when (at least) when trying to add a new radio station. I can confirm it with latest trunk (0.6pre).

Regards Emilio